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Following the Iowa caucuses, the gloves have clearly come off between Republican caucus winner Ted Cruz and runner-up Donald Trump.

After blustery businessman Donald Trump accused Ted Cruz of having “illegally stole” the Iowa caucus victory, the Texas Senator responded that Trump is clearly “losing it” and went on to attack his opponent's mental stability.

"It is no surprise that Donald is throwing yet another temper tantrum or if you like, another Trumpertantrum," Cruz said said in New Hampshire, which will hold its primary on Tuesday.

"I don't know anyone who would be comfortable with someone who behaves this way having his finger on the button. We're liable to wake up one morning and Donald, if he were president, would have nuked Denmark. That's not the temperament of a leader to keep this country safe,” the conservative senator added.

WATCH: Ted Cruz responded to Donald J. Trump's tweets challenging the Iowa results and said it's no surprise he threw a "Trumper-tantrum." http://fxn.ws/1PUImKW

Sanders talked about inequality in America, the lack of parental leave and problems with the US health care system and said the country should follow the lead of the Nordic nations.

“I think we should look to countries like Denmark, like Sweden and Norway, and learn from what they have accomplished for their working people,” Sanders, an outspoken proponent of adopting some form of the ‘Nordic model', said.

Clinton agreed that the US faces a myriad of problems, but distanced herself from Sanders's calls to emulate Scandinavia.

“But we are not Denmark. I love Denmark. We are the United States of America. And it's our job to rein in the excesses of capitalism so that it doesn't run amok and doesn't cause the kind of inequities we're seeing in our economic system,” she said.

In the most recent Republican debate, it was Sweden's turn to get thrown into the fray with Florida Senator Marco Rubio taking a jab at Sanders.

“Bernie Sanders is a socialist. I think Bernie Sanders is a good candidate for president – of Sweden,” Rubio said to laughter from the audience.

“The thing with some American politicians, such as Sarah Palin, is – I don't want to use the word stupid, but I do. They are. They are so ignorant about the rest of the world. They think there are two monarchies in the world. And that's the UK and Monaco, because of Grace Kelly,” Roger Lundgren, editor of Sweden's Kungliga (Royal) magazine, told The Local.